【摘要】 随着大规模新能源的不断接入，电网和配电网的规模不断扩大，由于电网中含有大量电力电子器件，传统的小电流接地系统故障选线方案难以保证选线精度。为解决这一问题，首先分析了含储能电站的主动配电网发生单相接地故障时的故障特性，即储能电站充、放电时不同的故障特性和谐振接地系统单相接地故障电流的分布特性，提出了基于储能电站控制策略的主动注入特征电气量的故障选线方法；然后详细分析和研究了适用于高精度故障选线的注入量频率选择方法，包括储能电站的控制策略及其参数选取原则；最后提出了基于零序电流中的10 Hz分量的选线判据。PSCAD/EMTDC仿真验证了储能电站控制策略的有效性、故障选线理论的正确性和方案实施的有效性。更多还原

【Abstract】 With the continuous integration of large-scale new energy, the scale of power grids and distribution networks is constantly expanding. Due to the large number of power electronic devices in the grid, the traditional fault line selection scheme for small current grounding systems can hardly ensure the line selection accuracy. To solve this problem, the fault characteristics of active distribution networks with energy storage power stations when single-phase grounding faults occur are analyzed, namely the different fault characteristics during the charging and discharging of energy storage power stations and the distribution characteristics of single-phase grounding fault current in resonant grounding systems. Then, a fault line selection method that actively injects characteristic electrical quantities based on the control strategy of energy storage power stations is proposed. Then, a detailed analysis and research on the injection quantity frequency selection method suitable for high-precision fault line selection is conducted, including the control strategy of energy storage power stations and its parameter selection principle. Finally, a line selection criterion based on the 10 Hz component in the zero-sequence current is proposed. The PSCAD/EMTDC simulation verifies the effectiveness of the energy storage power station control strategy, the correctness of the fault line selection theory, and the effectiveness of the scheme implementation.更多还原